参考地址为:https://www.cnblogs.com/sherrykid/p/5813148.html

 

1.连接

在 bin 目录下的  zkCli.sh  就是ZooKeeper客户端./zkCli.sh -timeout 5000  -server 127.0.0.1:2181 　　客户端与ZooKeeper建立链接timeout：超时时间，单位毫秒r：只读模式，当节点坏掉的时候，还可以提供读服务示例:./zkCli.sh -timeout 5000  -server 127.0.0.1:2181 Connecting to 127.0.0.1:21812018-09-19 16:48:35,332 [myid:] - INFO  [main:Environment@100] - Client environment:zookeeper.version=3.4.6-1569965, built on 02/20/2014 09:09 GMT2018-09-19 16:48:35,336 [myid:] - INFO  [main:Environment@100] - Client environment:host.name=iZ2ze4wl2jm5gr50lqkcu2Z2018-09-19 16:48:35,337 [myid:] - INFO  [main:Environment@100] - Client environment:java.version=1.8.0_1812018-09-19 16:48:35,339 [myid:] - INFO  [main:Environment@100] - Client environment:java.vendor=Oracle Corporation2018-09-19 16:48:35,339 [myid:] - INFO  [main:Environment@100] - Client environment:java.home=/usr/lib/jvm/java-8-oracle/jre2018-09-19 16:48:35,339 [myid:] - INFO  [main:Environment@100] - Client environment:java.class.path=/usr/local/zookeeper-3.4.6/bin/../build/classes:/usr/local/zookeeper-3.4.6/bin/../build/lib/*.jar:/usr/local/zookeeper-3.4.6/bin/../lib/slf4j-log4j12-1.6.1.jar:/usr/local/zookeeper-3.4.6/bin/../lib/slf4j-api-1.6.1.jar:/usr/local/zookeeper-3.4.6/bin/../lib/netty-3.7.0.Final.jar:/usr/local/zookeeper-3.4.6/bin/../lib/log4j-1.2.16.jar:/usr/local/zookeeper-3.4.6/bin/../lib/jline-0.9.94.jar:/usr/local/zookeeper-3.4.6/bin/../zookeeper-3.4.6.jar:/usr/local/zookeeper-3.4.6/bin/../src/java/lib/*.jar:/usr/local/zookeeper-3.4.6/bin/../conf:2018-09-19 16:48:35,339 [myid:] - INFO  [main:Environment@100] - Client environment:java.library.path=/usr/java/packages/lib/amd64:/usr/lib64:/lib64:/lib:/usr/lib2018-09-19 16:48:35,340 [myid:] - INFO  [main:Environment@100] - Client environment:java.io.tmpdir=/tmp2018-09-19 16:48:35,340 [myid:] - INFO  [main:Environment@100] - Client environment:java.compiler=<NA>2018-09-19 16:48:35,340 [myid:] - INFO  [main:Environment@100] - Client environment:os.name=Linux2018-09-19 16:48:35,340 [myid:] - INFO  [main:Environment@100] - Client environment:os.arch=amd642018-09-19 16:48:35,340 [myid:] - INFO  [main:Environment@100] - Client environment:os.version=4.4.0-117-generic2018-09-19 16:48:35,340 [myid:] - INFO  [main:Environment@100] - Client environment:user.name=root2018-09-19 16:48:35,341 [myid:] - INFO  [main:Environment@100] - Client environment:user.home=/root2018-09-19 16:48:35,341 [myid:] - INFO  [main:Environment@100] - Client environment:user.dir=/usr/local/zookeeper-3.4.6/bin2018-09-19 16:48:35,344 [myid:] - INFO  [main:ZooKeeper@438] - Initiating client connection, connectString=127.0.0.1:2181 sessionTimeout=5000 watcher=org.apache.zookeeper.ZooKeeperMain$MyWatcher@506c589eWelcome to ZooKeeper!2018-09-19 16:48:35,410 [myid:] - INFO  [main-SendThread(127.0.0.1:2181):ClientCnxn$SendThread@975] - Opening socket connection to server 127.0.0.1/127.0.0.1:2181. Will not attempt to authenticate using SASL (unknown error)JLine support is enabled2018-09-19 16:48:35,580 [myid:] - INFO  [main-SendThread(127.0.0.1:2181):ClientCnxn$SendThread@852] - Socket connection established to 127.0.0.1/127.0.0.1:2181, initiating session2018-09-19 16:48:35,591 [myid:] - INFO  [main-SendThread(127.0.0.1:2181):ClientCnxn$SendThread@1235] - Session establishment complete on server 127.0.0.1/127.0.0.1:2181, sessionid = 0x165f0e74c000003, negotiated timeout = 5000WATCHER::WatchedEvent state:SyncConnected type:None path:null如上，表示我们和ZooKeeper建立了连接，可以通过命令与ZooKeeper进行交互了2.查看命令帮助hZooKeeper -server host:port cmd args    stat path [watch]    set path data [version]    ls path [watch]    delquota [-n|-b] path    ls2 path [watch]    setAcl path acl    setquota -n|-b val path    history     redo cmdno    printwatches on|off    delete path [version]    sync path    listquota path    rmr path    get path [watch]    create [-s] [-e] path data acl    addauth scheme auth    quit     getAcl path    close     connect host:port        显示能够执行的命令命令分类和数据库相似，大概可以分为增删改查四类ZooKeeper数据结构：zookeeper.png放到桌面大多数时候，我们对ZooKeeper的操作都是在对节点进行增删改查常用命令： 查询相关指令ls path：列出path下的文件[zk: 127.0.0.1:2181(CONNECTED) 4] ls /[zookeeper]如上：列出根目录节点下的所有文件，目前就只有一个系统自带的zookeeper节点stat path：查看节点状态[zk: 127.0.0.1:2181(CONNECTED) 6] stat /zookeepercZxid = 0x0ctime = Thu Jan 01 08:00:00 CST 1970mZxid = 0x0mtime = Thu Jan 01 08:00:00 CST 1970pZxid = 0x0cversion = -1dataVersion = 0aclVersion = 0ephemeralOwner = 0x0dataLength = 0numChildren = 1cZxid:创建节点时的事务idpZxid:子节点列表最后一次被修改的事务idcversion:节点版本号dataCersion:数据版本号aclVerson:acl权限版本号get path：获取指定节点的内容ls2 path：列出path节点的子节点及状态信息3.创建指令create [-s] [-e] path data acl1 [zk: 127.0.0.1:2181(CONNECTED) 10] create /node_1 1232 Created /node_1如上：在根目录创建了node_1节点，携带数据 123使用 get /node_1 验证是否添加节点及其数据成功[zk: 127.0.0.1:2181(CONNECTED) 15] create -e /node_1/node_1_1 234Created /node_1/node_1_1创建了一个临时节点（-e），并且携带数据234，使用stat命令查看这个新建的临时节点[zk: 127.0.0.1:2181(CONNECTED) 16] stat /node_1/node_1_1cZxid = 0x200000003ctime = Sat Aug 27 15:27:30 CST 2016mZxid = 0x200000003mtime = Sat Aug 27 15:27:30 CST 2016pZxid = 0x200000003cversion = 0dataVersion = 0aclVersion = 0ephemeralOwner = 0x156cacb918b0000dataLength = 3numChildren = 0ephemeralOwner值不再是0，表示这个临时节点的版本号，如果是永久节点则其值为 0x01 [zk: 127.0.0.1:2181(CONNECTED) 1] create -s /node_1/node_1_1 2342 Created /node_1/node_1_10000000001通过使用-s参数，创建一个顺序节点，我们虽然指定的节点名是node_1_1，但是实际上，名称却是 node_1_10000000001，如果我们重复执行：[zk: 127.0.0.1:2181(CONNECTED) 2] create -s /node_1/node_1_1 234Created /node_1/node_1_10000000002效果如上 这个特性，我们可以利用一下，生成在分布式环境下的主键生成器 -s 和 -e 可以同时使用 4.退出：quit[zk: 127.0.0.1:2181(CONNECTED) 19] quitQuitting...2016-08-27 15:29:44,760 [myid:] - INFO  [main:ZooKeeper@684] - Session: 0x156cacb918b0000 closed2016-08-27 15:29:44,763 [myid:] - INFO  [main-EventThread:ClientCnxn$EventThread@519] - EventThread shut down for session: 0x156cacb918b0000这个时候如果重新登录，执行 ls /node_1，发现其子节点是空的，创建的node_1_1子节点不见了，那是因为之前创建的时候就已经指定了，我们创建的是一个临时节点。当客户端会话结束后，临时节点是会被删除了。 5.修改相关指定：set path data [version] 复制代码[zk: 127.0.0.1:2181(CONNECTED) 14] set /node_1 998cZxid = 0x200000002ctime = Sat Aug 27 15:24:39 CST 2016mZxid = 0x20000000amtime = Sat Aug 27 15:38:40 CST 2016pZxid = 0x200000008cversion = 5dataVersion = 2aclVersion = 0ephemeralOwner = 0x0dataLength = 3numChildren = 3复制代码如果我们多次修改，会发现  dataVersion ，也就是数据版本，在不停得发生变化（自增） 如果我们在set的时候手动去指定了版本号，就必须和上一次查询出来的结果一致，否则 就会报错。这个可以用于我们在修改节点数据的时候，保证我们修改前数据没被别人修改过。因为如果别人修改过了，我们这次修改是不会成功的  6.删除指令：delete path [version]删除指定节点数据，其version参数的作用于set指定一致 delete /node_1/node_1_10000000001整个节点全删除注意：delete只能删除不包含子节点的节点，如果要删除的节点包含子节点，使用rmr命令rmr /node_1